The antonyms for the word "de-humidify" are "humidify," "moisten," "dampen," "wet," "hydrate," "saturate," and "add moisture." All these words signify the process of increasing moisture levels in the atmosphere or a particular environment. The opposite of de-humidifying is not only about reversing the effects of reducing humidity, but it's also about creating a more favorable and comfortable living environment. People use humidifiers and other devices to increase humidity levels in their homes or workplaces, especially during the winter season when indoor heating dries out the air. By introducing moisture, people help prevent respiratory issues and skin irritation that occur due to dry air.